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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea453030f30b1f37d246492ab14f68530dce73d4856caa434fe92d2ff5f80367' 
  AND token = 'SgS+FrItEpgcylNy4Lh52b1rjeW52pdnIfMnb7w6kYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}